A catch-all feature that is enabled for a certain email mailbox will allow you to receive emails that are sent to addresses that do not really exist. To put it differently, if you deactivate an email address and someone still sends an email message to it, or to any misspelled address under the exact same domain, you’ll receive the email in the catch-all mailbox. Using this feature implies that you won’t miss an email for any reason whatsoever, which could be crucial in case you run some business, for instance. Since you may start receiving unsolicited emails, you can use the catch-all feature with email filters in order to get only legitimate messages in your inbox. Only one mailbox per domain can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.